计算文件大小

判断单个文件大小

//单个文件的大小

- (long long) fileSizeAtPath:(NSString*) filePath{

NSFileManager* manager = [NSFileManager defaultManager];

if ([manager fileExistsAtPath:filePath]){

return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
}
return 0;
}

通过计算来显示大小以MB为单位

long long fileSize = [[manager attributesOfItemAtPath:outputPath error:nil] fileSize];

 NSLog(@"%f MB",fileSize/(1024.0*1024.0));

判断文件夹总大小

//遍历文件夹获得文件夹大小，返回多少M

- (float ) folderSizeAtPath:(NSString*) folderPath{

NSFileManager* manager = [NSFileManager defaultManager];

if (![manager fileExistsAtPath:folderPath]) return 0;

NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];

NSString* fileName;

long long folderSize = 0;

while ((fileName = [childFilesEnumerator nextObject]) != nil){

NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];

folderSize += [self fileSizeAtPath:fileAbsolutePath];

}

return folderSize/(1024.0*1024.0);

}